Best way to benchmark my site

[Chris Carpenter]

So I am new to passenger and I am trying to make sure I am getting optimal performance before going live with the site.

In the Optimization Guide from passenger they recommended using wrk to test the site. I installed it and tested against my site and the numbers look abysmal to say the least. I thought the Requests/sec would be a lot higher.

chris@ubuntu14:~$ wrk -t12 -c50 -d30s http://mynewsite

Running 30s test @ http://mynewsite

  12 threads and 50 connections

  Thread Stats   Avg      Stdev     Max   +/- Stdev

    Latency   218.35ms  101.82ms 413.71ms   58.33%

    Req/Sec    17.50      0.52    18.00    100.00%

  4814 requests in 30.00s, 87.95MB read

  Socket errors: connect 0, read 0, write 0, timeout 128

Requests/sec:    160.44

Transfer/sec:      2.93MB

I figured that this setup would yield a higher throughput.

All servers at Digital Ocean

1 Load Balancer (haproxy) 2GB Ram / 2 CPU

2 Web Servers (Nginx, Passenger Enterprise) 8GB Ram / 4 CPU

The CPU usage on the load balancer hovers around 40% when testing, but both the web servers CPUs spike to 100% usage the entire time. Its just hard to believe that 50 connections is utilizing 100% CPU usage on two servers. Here is a snippet of my nginx.conf for both servers.

passenger_max_pool_size 7;

passenger_min_instances 7;

passenger_pre_start http://mynewsite/;

Any ideas of why this looks so bad? Are my ruby process supposed to be using 100% CPU usage when I get 50 users on the site?

EDIT: Using passenger enterprise 5.0.4 and nginx 1.6.2

[Hongli Lai]

If you use Rails, that number looks about right. Rails saturates your
CPU at about this many requests/sec. There are a few tweaks you can
make in the app server, such as using the builtin engine (also
documented in the Server Optimization Guide), but most of the time is
spent in the app itself. Optimizing the app will have the biggest
effect.

One notable exception is Passenger's turbocache, which can speed up
your app tremendously:
https://www.phusionpassenger.com/documentation/ServerOptimizationGuide.html#header_11

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